chemistryHow many moles of hydrogen would be obtained if 2.7g of aluminium reacts with excess hydrochloric acid?
March 5, 2015

TrigonometryFind exact value of each expression sec^-1 (2root3) / 5 I have no idea what to do to make that into a value. I know that sec^-1 is in quadrants one and two, but I'm not sure how to use that to solve the problem. Thank you!
February 12, 2015

physicsAn object having a net charge of 18.2 μC is placed in a uniform electric field of 790 N/C directed vertically upward, i.e. in the direction opposite gravity. What is the mass, in grams, of this object if it "floats" in the field? (Assume g = 9.80 m/s2.)
January 21, 2015

physcisTwo small beads having charges q1 and q2 are fixed so that the centers of the two beads are separated by a distance d shown in the figure. A third small bead of charge q=10.0 x 10-9 C is placed between both charges a distance x from q1. a) If q1 = 31.0 x 10-9 C, q2 = 26.0 x 10...
January 17, 2015

physicsA harmonic wave is traveling along a string. If the oscillator that generates the wave completes 23 vibrations in 18.50 seconds and if it takes a crest 20.21 seconds to travel 168 cm along the rope. What is the wavelength of the wave? Answer in cm.
November 24, 2014

PhysicsIn a horizontal spring-mass configuration, the position of the 0.52 kg mass is described by [x = (1.09 m) sin(2.70t)] a) What is in meters the amplitude of these oscillations? b) What is in m/s the maximum speed of the mass under these conditions? c) What is in Joules the ...
November 12, 2014

physicsThe position of a 0.31 kg object attached to a spring is described by [x = (0.85 m) sin(2.37πt + 0.35)] a) What is the amplitude of oscillations in m? b) What is in meters/second the maximum speed of the oscillating object? Answer in meters/seconds . c) Find in meters/...
November 11, 2014

physicsThe position of a 0.43 kg object attached to a spring is described by [x = (0.49 m) cos(1.25πt)] a) What is the amplitude of oscillations in m? b) What is in meters/second the maximum speed of the oscillating object? Answer in meters/seconds . c) Find in meters/second the...
November 11, 2014

physicsTwo masses are connected by a light string passing over a frictionless pulley as shown on Figure. The M2= 6.1 kg mass is released from rest at height h = 2.8 m . We are given that M1=2.7 kg and I, the moment of inertia of the pulley is I = 0.198 kg m2 and its radius is R = 0....
November 4, 2014

PhysicsA solid sphere of mass 2.07kg rolls up an incline with an inclination angle of 24.40°. At the bottom of the incline, the center of mass of the sphere has a translational speed of 2.80m/s. a) What is in J, the linear kinetic energy of the sphere at the bottom of the incline...
November 4, 2014

PhysicsConsider the rods plus disc system shown in the Figure. The rod has a length L =0.50 m, and mass M = 0.270kg. The large disc has a radius of R = 0.130m and mass m=0.810kg. The second disk should be treated as a point mass of 0.405kg. It is glued to the rod at position X = 0....
November 3, 2014

physicsAn m=150 g block hits an M= 265 g block initially at rest on a horizontal surface. After impact they stick together and slide 7.47 m before coming to rest. The coefficient of friction between blocks and surface is 0.39. a) What is in m/s the speed of both blocks immediately ...
November 1, 2014

physicaConsider the rods plus disc system shown in the Figure. The rods are identical. They have a length L =0.50 m, and mass M = 0.250kg. The disc has a radius of R = 0.130m and mass m=0.750kg. Both rods are glued to the disk as shown with X = 0.25m. The system behaves as a compound...
October 28, 2014

PhysicsA block of mass 11.2 kg slides from rest down a frictionless 24.0° incline and is stopped by a strong spring with a spring constant 31.3 kN/m (note the unit). The block slides 8.90 m from the point of release to the point where it comes to rest against the spring. When the...
October 25, 2014

AP ChemSorry if I was being unclear. Yes, this is an experiment that I conducted. We calculated the temperature change between one reactant and when the reaction occurred. The first reaction had a temp change of 12.5, the 2nd had 1.10, and the third had 5.8 degrees C. I've also ...
October 13, 2014

Calculous PreA population grows from 11,000 to 15,000 in three years. Enter your answers to three decimal places. Assuming the growth is exponential, find the growth rate and continuous growth rate Growth rate ______ %? Continuous rate _________ %?
October 3, 2014

English (Grammar)Would it be grammatically correct to say "Lastly, the Puritan values of appeasing towards God in every thing they do..." or "Lastly, the Puritan values of appeasing God in every thing they do..." I'm thinking the second one is grammatically correct but ...
September 4, 2014

Science A.) A runner is jogging at a steady 6.7 km/hr. When the runner is 3 km from the finish line, a bird begins flying from the runner to the finish line at 20.1 km/hr (3 times as fast as the runner). When the bird reaches the finish line, it turns around and flies back to the ...
August 28, 2014

chemistyHi, I'm a 10th grade student and this is how I would look at it... So what is being oxidized is what is losing electrons. So take Copper for example. Copper is going from a 1+ charge to no charge as a solid...so is it gaining an electron or losing. Now think of Iron. Iron ...
June 6, 2014

AlgebraHi, I'm a 10th grade student and this is how I think the problem would be solved... So let x = the amount you need to sell .03x = $420 + .02x .01x = $420 x = $42,000 So you would need to sell at least $42,000 in the first job be equal to the second job. Hope this helps!
June 5, 2014

ChemistryNever mind, I figured out I needed to convert the moles to grams and then I would use the q = mc delta t.
June 4, 2014

ChemistryThe heat capacity of aluminum is 24.4 J/mol times degrees C. How much energy is released when 5.00 g Al is cooled from 50 degrees C to 30 degrees C. a) 2440 J b) 90 J c) 3.7 J d) 488 J I said A, but the answer sheet says that the answer is B. Can someone please explain how ...
June 4, 2014

ChemistryI know what I did wrong. Some reason I divided the moles of C10H8 by .0120 instead of .120, so my answer was 11 times the answer it should have been. Thank you very much!
June 4, 2014

ChemistryI'm really confused on this question so if someone could show the steps and how to get the answer, that would be great. I understand that you would use delta T=Kbm, but don't know how to use the equation to find the answer. Thanks!! Calculate the boiling point of a ...
June 4, 2014

Algebra 1While playing a game, Rachel pulls two tiles out of a bag without looking and without replacing the first tile. The bag has two colors of tiles--black and white. There are 10 more white tiles than black tiles. a. Write and simplify an expression that represents the probability...
May 28, 2014

ChemistryI'm still a little bit unsure. The website didn't really specify why the ions disassociate with each other and associate with hydrogen bonding
May 8, 2014

ChemistrySo I am trying to understand in molecular terms the solubility of NaCl in water. So there are intramolecular forces that are mostly ionic between the ions, creating this partial positive, partial negative substance. And the intermolecular forces are also ionic. Ionic forces ...
May 8, 2014

HistoryBoth Hitler and Churchill were gifted orators. Compare their styles. I was thinking something like that they both used nationalism to make themselves popular within the people. And they spoke to create nationalism in their country. Does this make sense and also how do their ...
April 23, 2014

Math 10Algebraically, determine the vertex form of a quadratic relation, if the vertex is at (-1, 2) and the point (1, -10) is on the parabola. Show all of your steps. I know that the formula is y=a(x-h)suared+ k but how do i apply these numbers to this formula? Thank you!
April 22, 2014

Math 10Hello, Is there easiest and simplest way to do this question? "A baseball is thrown from the top of a building and falls to the ground below. The height of the baseball above the ground is approximated by the relation h = -5t2 + 10t + 15, where h is the height above the ...
April 13, 2014

EnglishI have an essay and this is one part of my thesis... "In the nineteenth century, some ways the middle class participated in revolutions was by establishing liberalism, one way was through literature, and through the revolutions of 1848." I wasn't sure if the &...
March 24, 2014

LitI have an essay and this is one part of my thesis... "In the nineteenth century, some ways the middle class participated in revolutions was by establishing liberalism, one way was through literature, and through the revolutions of 1848." I wasn't sure if the &...
March 24, 2014

ChemistryIn a heating and cooling curve, I understand that the flat part means that the bonds are either forming or breaking, depending on if the input of energy is increasing or decreasing, but what is happening to the bonds in the slanted parts? Thanks!
March 19, 2014

ChemistryI have discovered a new chemical compound with the formula A2B. If a saturated solution of A2B has a concentration of 4.35x10-4M. a) What is the concentration of B2- ions? b. What is the concentration of A1+ ions? c. What is the solubility product constant for A2B? Can you ...
March 16, 2014

Title Hi I need help thinking of a title for my graphic novel. It is about India and its exploitation of children. Could someone help me think of a cool title and an idea to make the title look unusual. Like maybe a bleed or something. Thanks!!
February 17, 2014

mathYes, you are right. Use distribution and multiply each number in the parenthesis aka the "10x" and "-12" by -3. So it would be 10x(times -3) - 12(times -3) -30x - -36 -30x + 36 Thats your answer. Hope this helps! Serena, a 10th grade student
December 17, 2013

Math1. So you know that the slope intercept form is y=mx+b, right. And m is the slope. So in this case there is no straight out coefficient, but x is also equal to 1x. Therefore one is your slope. 2. So first bring -6 to the opposite side of the equation by adding 6 to each side. ...
December 17, 2013

MathIf you are describing a graph that consists of a parabola and a line that intersect at two points, would the system be dependent and consistent. Or is dependent only used if the system has an infinite amount of solutions? Thanks!
November 14, 2013

Essay TitleHi. I need help thinking of a title for the essay I am writing. The essay is about the Dominican Republic and Trujillo's regime. Specifically I am talking about how women who accept/deny female stereotypes accept/deny male domination. Can someone help me thing of a title. ...
November 11, 2013

college essayHere's another one for editing papers. Your paper was well-written btw. Hope you make it in! I can't paste the link in so if you go to Paper Rater's website, that could help.
November 10, 2013

MathSo substitute one of the x values in x. For example, substitute -3 for x f(x)=-(-3)+4 f(x)=3+4 f(x)=7 Therefore one of the values for y is 7. Do that for the rest of the x values and you will get the answers. Hope this helps!
November 7, 2013

mathSo first what you want to do it two put the numbers in order from least to greatest. 1, 1, 2, 2, 3, 3, 4, 4, 4, 5, 5, 6, 7, 16 So to find the mode you want to see which number is listed the most. That would be 4. To find the median you want to find the middle number of this ...
November 7, 2013

Magic Thesis StatementI am trying to argue that most weak women in the Dominican Republic during Trujillo's obeyed male domination. While the strong women would manipulate gender context to get what they want or to defy the power hierarchy.
November 7, 2013

Magic Thesis StatementHi! I'm writing an essay about how women act according to male or female domination. Could you please look at my magic thesis and tell me if my why is well written. Thanks! By examining the gender context during Trujillo's regime, one can see that some women who are ...
November 7, 2013

Math help pleaseWell for this problem what you would do is you would take each set of ordered pairs and substitute the x coordinate for x and the y coordinate for y. If for all 5 ordered pairs a function works, then that is your answer. For example take the first one. With the set of ...
November 7, 2013

Algebra 2 @ SteveI have another question regarding functions, but instead if you are adding up functions that are in a radical. f(x) and g(x) are both square root of x+5. To find the domain of f+g, f-g, fg, and f/g, would I find the domain of each function...[-5,infinity)? And then what? How ...
November 2, 2013

Algebra 2I am doing a similar problem where f(x) and g(x) are both square root of x+5. To find the domain of f+g and all that would I find the domain of each function...[-5,infinity). And then what? How would I add each set up?
November 2, 2013

Algebra 2f(x) = x^2 + 2 g(x) = 2x^2 - 1 Find the domain of f+g, f-g, fg, and f/g Can someone please explain to me how you would do this problem?
November 2, 2013

mathsSo for a triangle, two sides have to be greater than the largest side. Therefore, if you have three sides 7, 15, and x, you could say that... a) x is the largest b) 15 is the largest. a) If x is the largest side then 7+15 has to be greater than x. 22 has to be greater than x. ...
November 2, 2013

Algebra 2If the point P is on the graph of a function f, find the corresponding point on the graph of a given function. P (0,5) y = f ( x + 2 ) - 1
October 28, 2013

Chemistry - is this correct?Your electron configuration is right. b) Yes, there are 8 electrons in the highest energy sublevel. c) For part c I think it would be 10 because when you look at the last orbit, it includes both s-block and d-blocks. So when you include the electrons from 4s^2 and 3d^8, there ...
October 28, 2013

Algebra 2Can you please explain how to set up the equation? A city council is proposing a new skyline ordinance. It would require the setback S for any building from the residence to be a minimum of 100 feet, plus an additional 6 feet for each foot of height above 25 feet. Find a ...
October 28, 2013

EnglishSo if I changed it to... The hero displayed gallantry when he saved the woman. Is that better?
October 24, 2013

EnglishCan you please tell me if I use this word correctly? Gallantry: The hero was ready for the gallantry that came with saving the woman.
October 24, 2013

Turabian CitationFor citing using the Turabian or Chicago format, do you have to put a subscript and a footnote at the end of every sentence? If not, if you have two sentences that belong to the same source, would you put the footnote at the end of the second sentence like in-text citation?
October 20, 2013

ChemistryWhen electrons get excited can they only move up one level or can they go up multiple orbitals, but just one at a time.
September 21, 2013

Simple EnglishCan you please rephrase this into words that are easier to understand? How might the scope of his criticism have been limited by his choice of forum? Thanks :)
September 17, 2013

AlgebraAn asthma medicine is to be prepared from an elixir with a drug concentration of 5 mg/mL and a cherry flavored syrup that is to be added to hide the taste of the drug. How much of each must be used to prepare 100 mL of solution with a drug concentration of 2 mg/mL?
September 16, 2013

ChemistryI have all that information, but I still don't understand how to do it. How would you find the constant. And what does the s^ -1 stand for?
September 16, 2013

AlgebraAn asthma medicine is to be prepared from an elixir with a drug concentration of 5 mg/mL and a cherry flavored syrup that is to be added to hide the taste of the drug. How much of each must be used to prepare 100 mL of solution with a drug concentration of 2 mg/mL?
September 16, 2013

AlgebraBefore the final exam, a student has test scores of 72, 80, 65, 78, and 60. If the final exam counts as one-third of the final grade, what score must the student recieve in order to have a final average of 76 percent? Thanks!!
September 14, 2013